Step 1

Very lightly toast the bread to firm it up, then set aside.

Step 2

Divide ground chuck into three equal portions and flatten each into a large rectangle, 1-2" longer than the bread. (it will shrink during cooking) Then liberally salt and pepper each side of the meat.

Step 3

In a large skillet set over medium heat, melt 2 tablespoons of butter and add onions. Saute until browned. Remove and set aside.

Step 4

Set skillet to medium high heat and add 2 tablespoons of butter then add hamburger patties, working in batches as needed. Flip once and cook until the patties reach your desired degree of doneness.

Step 5

While patties are cooking spread 1 tablespoon of butter to exterior of each piece of bread and spread the inside of slice for each sandwich with mayo. Place buttered side down and add a slice of cheese to each slice of bread.

Step 6

Place the cooked patty on the non-mayoed side of bread, top with onions, and cover with the mayoed bread.

Step 7

Place patty melts in a clean skillet on medium heat and let cook until the toasted bread turns golden brown and cheese has melted, flip and repeat. Then serve immediately.